Simultaneous enhancement of the efficiency and stability of organic solar cells using PEDOT:PSS grafted with a PEGME buffer layer
- Authors
- Lee, Jung Joon; Lee, Seung Hwan; Kim, Felix Sunjoo; Choi, Hyang Hee; Kim, Jung Hyun
- Issue Date
- Nov-2015
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Organic solar cell; PEDOT:PSS; Condensation reaction; Work function; Stability
- Citation
- ORGANIC ELECTRONICS, v.26, pp 191 - 199
- Pages
- 9
- Journal Title
- ORGANIC ELECTRONICS
- Volume
- 26
- Start Page
- 191
- End Page
- 199
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/8933
- DOI
- 10.1016/j.orgel.2015.07.022
- ISSN
- 1566-1199
1878-5530
- Abstract
- We report a simple processing method to simultaneously improve the efficiency and stability of organic solar cells (OSCs). Poly(4-styrene sulfonate)-doped poly(3,4-ethylenedioxy-thiophene (PEDOT:PSS), widely used as hole transport layer (HTL) in OSCs, tends to accelerate the degradation of devices because of its hygroscopic and acidic properties. In this regard, we have modified PEDOT: PSS to reduce its hygroscopic and acidic properties through a condensation reaction between PEDOT: PSS and poly(ethylene glycol) methyl ether (PEGME) in order to improve the efficiency and stability of OSCs. As a result, the power conversion efficiency (PCE) increased by 21%, from 2.57% up to 3.11%. A better energy level alignment by the reduced work function of the modified PEDOT: PSS with a highest occupied molecular orbital (HOMO) level of poly(3-hexylthiophene-2,5-diyl) (P3HT) is considered the origin of the improved the efficiency. The half-life of OSCs with PEDOT: PSS modified with PEGME buffer layer also increased up to 3.5 times compared to that of devices with pristine PEDOT: PSS buffer layer. (C) 2015 Elsevier B.V. All rights reserved.
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Collections - College of Engineering > School of Chemical Engineering and Material Science > 1. Journal Articles
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